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学习笔记:临床回顾性研究实用指南(七)常用的统计假设检验方法②

  • 2026-03-02 12:18:48
学习笔记:临床回顾性研究实用指南(七)常用的统计假设检验方法②

提示:

本次推送包括本章节 第二部分 计数资料的假设检验方法 和 第三部分 基于秩次的非参数检验方法 

目录

第七章 数据的收集、录入及整理
    一、计量资料的假设检验方法
    二、计数资料的假设检验方法
    三、基于秩次的非参数检验方法   

关键词中英文对照
检验假设 hypothesis test
参数检验 parametric test
单因素方差分析 one way analysis of variance, one way ANOVA

关键内容摘要

计数资料的假设检验方法

1.卡方检验

χ2分布,用于推断两个或多个总体率之间有元差别、两个分别变量之间有无关联性和频数分布的拟合优度检验等。

【问题分析】本例的资料为分类变量整理后的计数资料,分组为不同地区,检出的类别有两类(检出和未检出),像这样的资料又称四格表资料。可以使用卡方检验进行两组检出率的比较。

【结果解释】第一行是Pearson卡方检验的结果,也是本例应该选择的检验方法。统计量χ2= 14.819, P<0.001 。

【结论】两种饮水区的大骨节病检出率不同,差异有统计学意义。

四格表(2×2列联表)是统计学中最基本的列联表形式,用于分析两个二分类变量之间的关联性

理论频数(T 或 E) 是指在原假设(H₀:两个变量独立/无关联)成立的前提下,我们期望在每个单元格中观察到的频数

对于上表而言就是

理论频数的意义

1. 衡量偏离程度

理论频数代表"无关联"时的期望值。实际观察值(O)与理论频数(T)的差异越大,说明两个变量的关联性越强。

2. 卡方检验的基础

Pearson卡方统计量就是基于观察值与理论频数的差异计算的:

3. 判断适用条件

  • T ≥ 5:所有理论频数≥5,可直接使用Pearson卡方检验

  • 1 ≤ T < 5:使用连续性校正(Yates校正)或Fisher精确检验

  • T < 1:必须使用Fisher精确检验

2.校正卡方检验和Fisher确切概率法

χ2分布是连续性分布,当四格表中理论频数较小时,估计的χ2值偏大,需进行校正。

基于秩次的非参数检验方法

维度
参数检验
Parametric Tests
非参数检验
Non-parametric Tests
数据分布
要求数据服从特定分布(通常是正态分布)
不要求特定分布,分布自由(distribution-free)
参数估计
基于总体参数(μ, σ²)进行推断
不依赖总体参数,基于秩次或频数
数据类型
主要适用于连续型数值变量
适用于各种数据类型,包括分类变量和等级变量
检验效能
较高(满足条件时)
相对较低(约90-95%的参数检验效能)
样本量要求
通常需要较大样本
小样本也适用
对异常值敏感性
敏感
不敏感(稳健)

1.单样本及配对设计样本的符号秩检验

Wilcoxon符号秩检验( signed rank test )

2.两独立样本的秩和检验

Mann-Whitney U检验

3.多独立样本的秩和检验

Kruskal-Wallis H检验

4. 其他基于秩次的非参数检验

Friedman M检验

以上内容援引自《临床回顾性研究实用指南》,系自行学习总结,如有版权问题请联系删除。

《临床回顾性研究实用指南》学习中,前期笔记链接如下:
学习笔记:临床回顾性研究实用指南(一)
学习笔记:临床回顾性研究实用指南(二)
学习笔记:临床回顾性研究实用指南(三)文献检索及文献管理
学习笔记:临床回顾性实用指南(四)临床回顾性研究的架构
学习笔记:临床回顾性实用指南(五)数据的收集、录入及整理
学习笔记:临床回顾性实用指南(六)临床回顾性研究统计分析概述 重要性 ※※※
学习笔记:临床回顾性实用指南(七)常用的统计假设检验方法①

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  1. CONNECT:[ UseTime:0.000551s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000931s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000715s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000781s ]
  8. SELECT * FROM `article` WHERE `id` = 471302 LIMIT 1 [ RunTime:0.000483s ]
  9. UPDATE `article` SET `lasttime` = 1772457218 WHERE `id` = 471302 [ RunTime:0.006612s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000271s ]
  11. SELECT * FROM `article` WHERE `id` < 471302 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000385s ]
  12. SELECT * FROM `article` WHERE `id` > 471302 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000363s ]
  13. SELECT * FROM `article` WHERE `id` < 471302 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000588s ]
  14. SELECT * FROM `article` WHERE `id` < 471302 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000729s ]
  15. SELECT * FROM `article` WHERE `id` < 471302 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000746s ]
0.082985s